For modals, we USUALLY use something like this:


//CSS Code

#modal {
    width: 100%;
    height: 0%;
}

and then with JavaScript, we just make the height to 100% when we display the modal.

Now there are few ways to display the modal from bottom. We can use margin-top directly or we can use animation to do the same with animation effect. I am going to discuss the first method.

Solution: Using margin-top


//CSS Code

#modal {
    width: 100%;
    height: 0%;
    margin-top:100%;
}

After that using JavaScript, remove the margin-top by setting it's value to zero along with changing the height to 100%.

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